package com.sky.interceptor;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.sky.constant.JwtClaimsConstant;
import com.sky.constant.MessageConstant;
import com.sky.exception.TokenException;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import com.sky.utils.ThreadLocalUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.jetbrains.annotations.NotNull;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {


    private final JwtProperties jwtProperties;
    private final RedisTemplate<Object, Object> redisTemplate;

    @Autowired
    public JwtTokenAdminInterceptor(JwtProperties jwtProperties, RedisTemplate<Object, Object> redisTemplate) {
        this.jwtProperties = jwtProperties;
        this.redisTemplate = redisTemplate;
    }

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(@NotNull HttpServletRequest request, @NotNull HttpServletResponse response, @NotNull Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getAdminTokenName());
        String token2 = (String) redisTemplate.opsForValue().get(token); //从redis中去令牌
        if (token2 == null) {
            throw new TokenException(MessageConstant.TOKEN_ERR);
        }
        //2、校验令牌
        try {
            log.info("AdminJwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getAdminSecretKey(), token);
            long empId = Long.parseLong(claims.get(JwtClaimsConstant.EMP_ID).toString());
            ThreadLocalUtil.set(empId);
            log.info("当前员工id：" + empId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            response.setContentType("application/json;charset=UTF-8");
            response.getWriter().write(new ObjectMapper().writeValueAsString(Map.of("code", response.getStatus(),
                    "message", request.getRequestURI() + " 访问资源失败，请重试")));
            return false;
        }
    }


    @Override
    public void afterCompletion(@NotNull HttpServletRequest request, @NotNull HttpServletResponse response, @NotNull Object handler, Exception ex) {
        ThreadLocalUtil.remove();
    }
}
